Circuit for correcting faulty operations in a drive circuit for electrical machines

A polyphase alternating current is supplied from an inverter (22) to a plurality of coils (L1-L12) of a motor/generator (10, 11). A plurality of PWM signal generating circuits (26) respectively control the current supplied to the coils (L1-L12) such that the difference between the electrical potential at a neutral point (Nm) of the coils (L1-L12) and the electrical potential at the neutral point (Ni) of the output terminals (TO) of the inverter (22) is reduced. Such control suppresses the generation of noise and vibration and torque fluctuations in the motor/generator (10, 11) due to a disconnection in the coils (L1-L12).